Hi, I had an interior smell which I sorted out. During frosty weather my rear washer stopped working as the nozzle had frozen. However it still didn't work after the cold weather had gone. I then started to get a bad smell in the car. I should have twigged earlier as when I reversed and stopped the the car in the drive when I heard a sloshing sound. I though it was the petrol in the tank. I then would fill up the washer bottle and literally see the water drain away before my eyes.. I looked under the car expecting to see water dripping out...but nothing. I then looked further into the problem and then found out that a hose union in the rear of the car had come loose due to the back pressure from the frozen nozzle, which also then syphoned the water into the spare tyre well. The spare tyre cover would get wet and hence the bad smell. Hope that helps you out.